Ferromagnetism and Conductivity in Atomically Thin 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>SrRuO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Boschker, Hans; Harada, T.; Asaba, Tomoya; Ashoori, R. C.; Boris, A. V.; Hilgenkamp, H.; Hughes, C. R.; Holtz, Megan E.; Li, Lu; Muller, David A.; Nair, Hari P.; Reith, Pim; Wang, Renshaw Xiao; Schlom, Darrell G.; Soukiassian, A.; Mannhart, J.

doi:10.1103/physrevx.9.011027

Cited by 64 publications

(77 citation statements)

References 54 publications

(75 reference statements)

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“…Physically, the difference in the phase shifts in Eqs. (14) and (15) comes from the difference in the Berry phases of quadratic and linear dispersions 76 .…”

Section: Methodsmentioning

confidence: 99%

“…Although Weyl fermions have been predicted to exist in various oxides [6][7][8] , evidence for their existence in oxide materials remains elusive [9][10][11] . SrRuO 3 , a 4d ferromagnetic metal often used as an epitaxial conducting layer in oxide heterostructures [12][13][14][15] , provides a promising opportunity to seek the existence of Weyl fermions in a magnetic material. State-of-the-art oxide thin film growth technologies, augmented by machine learning techniques, may allow access to such topological matter.…”

mentioning

confidence: 99%

“…Theoretically, the presence of Weyl fermions has been predicted for SrRuO 3 , a 4d ferromagnetic material 7 . SrRuO 3 is widely used as an epitaxial conducting layer in oxide electronics and spintronics owing to the unique nature of ferromagnetic metal, compatibility with other perovskite-structured oxides, and chemical stability [12][13][14][15]34 . Theoretical studies predicted that the electronic structure of SrRuO 3 may include a large number of Weyl nodes caused by the TRS breaking and spin-orbit coupling (SOC) (Fig.…”

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confidence: 99%

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Quantum transport evidence of Weyl fermions in an epitaxial ferromagnetic oxide

et al. 2020

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Magnetic Weyl semimetals have novel transport phenomena related to pairs of Weyl nodes in the band structure. Although the existence of Weyl fermions is expected in various oxides, the evidence of Weyl fermions in oxide materials remains elusive. Here we show direct quantum transport evidence of Weyl fermions in an epitaxial 4d ferromagnetic oxide SrRuO3. We employ machine-learning-assisted molecular beam epitaxy to synthesize SrRuO3 films whose quality is sufficiently high to probe their intrinsic transport properties. Experimental observation of the five transport signatures of Weyl fermions—the linear positive magnetoresistance, chiral-anomaly-induced negative magnetoresistance, π phase shift in a quantum oscillation, light cyclotron mass, and high quantum mobility of about 10,000 cm2V−1s−1—combined with first-principles electronic structure calculations establishes SrRuO3 as a magnetic Weyl semimetal. We also clarify the disorder dependence of the transport of the Weyl fermions, which gives a clear guideline for accessing the topologically nontrivial transport phenomena.

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“…Physically, the difference in the phase shifts in Eqs. (14) and (15) comes from the difference in the Berry phases of quadratic and linear dispersions 76 .…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Quantum transport evidence of Weyl fermions in an epitaxial ferromagnetic oxide

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“…(b) Summary of measurement results for all techniques used, where "n", "n.m." and "y" stand for "no", "not measured" and "yes", respectively. [18,61]. Torque magnetometry measurements revealed no significant signal in the fully annealed sample.…”

Section: Torque Magnetometrymentioning

confidence: 94%

Exploring possible ferromagnetism of the LaAlO3/SrTiO3 interface

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Boschker

Asaba

et al. 2019

Phys. Rev. Materials

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We report on extensive investigations of magnetism at the n-type LaAlO 3 /SrTiO 3 interface performed by utilizing a spectrum of local and integrative analytical techniques: Scanning superconducting quantum interference device microscopy, polar Kerr magnetometry, ferromagnetic resonance, and magnetic torque magnetometry. The samples originated from the same wafers. For nominally fully oxidized samples, we find that the mere presence of the conducting interface does not induce magnetism to values exceeding already present magnetic signals originating from the substrates, irrespective of the measurement technique. With the controlled introduction of oxygen vacancies, however, the different analytical techniques with their inherently different sensitivities and potential interactions with possible magnetic moments in the samples yield different results concerning the existence of magnetism. These unexpected differences obtained with the various measurement techniques are a possible source of the disagreement in the literature about the existence of ferromagnetism at LaAlO 3 /SrTiO 3 interfaces.

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“…Recent years have seen intense interest in stabilizing and controlling magnetic ordering in two-dimensional (2D) systems (1)(2)(3)(4)(5)(6)(7)(8)(9), motivated by both the potential to unlock new fundamental physics and enable new high-density, low-power spintronic device paradigms. Engineering magnetic anisotropy (MA) in 2D systems plays a critical role in realizing these new functionalities but remains challenging because of the lack of accessible control parameters.…”

Section: Introductionmentioning

confidence: 99%

Correlation-driven eightfold magnetic anisotropy in a two-dimensional oxide monolayer

et al. 2020

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Engineering magnetic anisotropy in two-dimensional systems has enormous scientific and technological implications. The uniaxial anisotropy universally exhibited by two-dimensional magnets has only two stable spin directions, demanding 180° spin switching between states. We demonstrate a previously unobserved eightfold anisotropy in magnetic SrRuO3 monolayers by inducing a spin reorientation in (SrRuO3)1/(SrTiO3)N superlattices, in which the magnetic easy axis of Ru spins is transformed from uniaxial 〈001〉 direction (N < 3) to eightfold 〈111〉 directions (N ≥ 3). This eightfold anisotropy enables 71° and 109° spin switching in SrRuO3 monolayers, analogous to 71° and 109° polarization switching in ferroelectric BiFeO3. First-principle calculations reveal that increasing the SrTiO3 layer thickness induces an emergent correlation-driven orbital ordering, tuning spin-orbit interactions and reorienting the SrRuO3 monolayer easy axis. Our work demonstrates that correlation effects can be exploited to substantially change spin-orbit interactions, stabilizing unprecedented properties in two-dimensional magnets and opening rich opportunities for low-power, multistate device applications.

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Ferromagnetism and Conductivity in Atomically Thin SrRuO3

Cited by 64 publications

References 54 publications

Quantum transport evidence of Weyl fermions in an epitaxial ferromagnetic oxide

Quantum transport evidence of Weyl fermions in an epitaxial ferromagnetic oxide

Exploring possible ferromagnetism of the LaAlO3/SrTiO3 interface

Correlation-driven eightfold magnetic anisotropy in a two-dimensional oxide monolayer

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